T R U ' C S N G D A I H O C S U ' P H A M K Y T H U A T
T H A N H P H O H O C H I M I N H
K H O A C O K H I C H E T A O M A Y
B O M O N : C O S O T H I E T K E M A Y
B E T H I C U O I K Y H O C K Y I N A M H O C 2 0 1 9 - 2 0 2 0
M 6 n : N g u y e n l y - C h i t i l t m a y
M 3 m 6 n h o c : M E M D 2 3 0 3 2 3
D l s 6 / M a d l : H K I 2 0 1 9 - 2 0 2 0 t h i c o 0 2 t r a n g
T h a i g i a n : 9 0 p h u t .
B u g c p h e p s i r d u n g 0 3 t e r A 4 v i l t t a y , k h o n g p h o t o c o p y .
C a u 1 : ( 2 , 5 d i e m )
B o t r u y l n d a i d e t c o t i s 6 t r u y l n u = 2 , k h o a n g e a c h t r u e a = 5 3 2 m m , g o c o m t r e n b a n h d a n a ,
= 1 6 5 °
a . X a c d i n h d u d n g k i n h d h d 2 c u a c a c b a n h d a i ? ( I d )
b . C h o b i e t t r u e d a n c 6 c o n g s u i t P j = 5 , 5 K w , t o e d o n j = 1 4 6 0 v g / p h u t , l u c c a n g b a n d i u F 0 =
6 0 0 N . B o q u a l i r e c a n g p h u , h a y x a c d i n h c a c l u c c a n g t r e n d a y d a i F h F 2 ? ( I d )
c . X a c d i n h h e s o m a s a t / n h o n h l t g i u a d a i v a c a c b a n h d a i d e b o t r u y d n k h o n g b i t r u o t t r o n ?
( 0 , 5 d )
C a u 2 : ( 2 , 5 d i e m )
H e t h o n g d i n d o n g t h i e t b i n a n g g 6m d o n g c o d i e n , b o t r u y e n b a n h r i n g n g h i e n g , h o p g i a m
r \ i r
t o e t r u e v i t c o c h i e u c h u y e n d o n g c u a t a n g q u a y n h u K i n h 1 . T o e d o q u a y c u a d o n g c o n < j c =
1 4 5 0 v / p h . B o t r u y e n t r u e v i t c o : s 6 d a u m 6i r e n t r u e v i t Z 3= 2 , s o r a n g t r e n b a n h v i t Z 4 = 5 0 ,
d u e m g k i n h v o n g c h i a t r u e v i t d 3 = 8 0 m m v a k h o a n g e a c h t r u e c u a b o t r u y S n t r u e v i t l a a W 34=
2 4 0 m m ( b o t r u y e n k h o n g d i c h c h i n h ) . T r u e I I I c u a b a n h v i t c o m o m e n x o l n T n f = 9 x l 0 5 N m m .
H i e u s u a t c h u n g l a T ] = 0 , 7 5 v a t y s 6 t r u y l n c h u n g u = 7 5 . H a y :
a . P h a n t i c h p h u o r n g , c h i l u l u c a n k h o p c u a b o t r u y e n b a n h r a n g v a b o t r u y l n t r u e v i t ? ( I d )
b . X a c d i n h m o d u n ( m ) v a h e s o d u o n g k i n h (q ) c u a t r u e v i t ? ( I d )
c . T i n h m o m e n x o l n v a c o n g s u i t t r e n t r u e d o n g c o ? ( 0 , 5 d )
F T i n h 1 H i n h 2
C a u 3 : ( 2 d i l m )
C h o h e b a n h r a n g n h u h i n h 2 , C a c b a n h r a n g t i e u c h u l n c o Z t = 2 0 , Z 2 = 4 0 , Z ’ 2 = 2 0 , Z 3 = 5 0 ,
Z ! 3 = 4 0 , Z 4 = 6 0 , Z ’ 4 = 1 8 , Z 5 = 3 6 . T 6c d o q u a y c l n C l a n c = 4 5 0 v g / p h . H a y t i n h :
a . T 6c d o q u a y n 3 c u a b a n h r a n g Z 3 ? ( 0 , 5 d )
b . T o e d o q u a y n j c u a b a n h r a n g Z j ? ( l , 5 d )
S o h i e u : B M 1 / Q T - P B B C L - R B T V T r a n g 1 / 2
